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Environ Geochem Health. 2019 Feb 27. doi: 10.1007/s10653-019-00257-y. [Epub ahead of print]

The effect of two different biochars on remediation of Cd-contaminated soil and Cd uptake by Lolium perenne.

Li L1, Jia Z1, Ma H1, Bao W1, Li X1, Tan H1, Xu F1, Xu H2, Li Y3.

Author information

1
Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, People's Republic of China.
2
Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, People's Republic of China. xuheng64@sina.com.
3
Institute of Soil and Groundwater Pollution Control of Sichuan Academy of Environmental Sciences, Chengdu, 610041, Sichuan, People's Republic of China. liyz0623@163.com.

Abstract

Biochar can be widely used to reduce the bioavailability of heavy metals in contaminated soil because of its adsorption capacity. But there are few studies about the effects of biochar on cadmium uptake by plants in soil contaminated with cadmium (Cd). Therefore, an incubation experiment was used to investigate the effects of rice straw biochar (RSBC) and coconut shell biochar (CSBC) on Cd immobilization in contaminated soil and, subsequently, Cd uptake by Lolium perenne. The results showed that the microbial counts and soil enzyme activities were significantly increased by biochar in Cd-contaminated soil, which were consistent with the decrease of the bioavailability of Cd by biochar. HOAc-extractable Cd in soil decreased by 11.3-22.6% in treatments with 5% RSBC and by 7.2-17.1% in treatments with 5% CSBC, respectively, compared to controls. The content of available Cd in biochar treatments was significantly lower than in controls, and these differences were more obvious in treatment groups with 5% biochar. The Cd concentration in L. perenne reduced by 4.47-26.13% with biochar. However, the biomass of L. perenne increased by 1.35-2.38 times after adding biochar amendments. So, Cd uptake by whole L. perenne was augmented by RSBC and CSBC. Accordingly, this work suggests that RSBC and CSBC have the potential to be used as a useful aided phytoremediation technology in Cd-contaminated soil.

KEYWORDS:

Aided phytoremediation technology; Bioavailability; Cd-contaminated soil; Coconut shell biochar; Lolium perenne; Rice straw biochar

PMID:
30810981
DOI:
10.1007/s10653-019-00257-y

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